RedForeman ©® intoned :

This may not be the best place to ask, but I am looking for a
type of small fish that will form a tight school in my 30 long tank
that I discussed earlier. Neons aren't tight enough. TIA
--
Sam-I-Am

drop in a predator, and they'll get closer... tight is relative....

Heh...

--
Sam-I-Am
Is there anything more satisfying, more healing, more enjoyable, more
important in your life than your next breath? Don't let it go by
unnoticed. Take your time and savor it. - Beth Johnson